In 2022, some two months after Russian troops invaded Ukraine, Putin said the Sarmat would “reliably ensure the security of Russia from external threats and make those, who in the heat of aggressive rhetoric try to threaten our country, think twice”

Source: https://www.aljazeera.com/news/2023/9/2/russia-puts-advanced-sarmat-nuclear-missile-system-on-combat-duty?traffic_source=rss

Jeffrey Lewis, a nonproliferation professor at the Middlebury Institute of International Studies in Monterey, California, told Insider after the April launch that the Sarmat is a weapon akin to a "Cold War throwback."

Source: https://www.businessinsider.com/russia-wanted-putin-brag-icbm-launch-but-failed-report-2023-2

Russia conducted its first test of the Sarmat ICBM in late April.

Source: https://247wallst.com/special-report/2023/06/21/what-a-nuclear-attack-would-do-to-americas-25-largest-cities/